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555 Timer Chip, Simple Buzzer Circuit

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555 Timer Circuit, Simple Buzzer Circuit
Here is a very simple to build buzzer circuit using a cheap 555 timer chip. Just close the switch and the unit outputs a 962 Hz tone. For a lower tone of 481 Hz, just parallel another 100 nF capacitor to the existing one. For a higher tone of say, 1924 Hz, replace the 100 nF with a 0.05 uF capacitor.